#pragma once

#ifndef PLANE_VIEWER_H

#define PLANE_VIEWER_H

// TnzCore includes

#include "tcommon.h"

#include "traster.h"

#include "timage.h"

// TnzQt includes

#include "toonzqt/glwidget_for_highdpi.h"

// Qt includes

#include <qopenglwidget></qopenglwidget>

#include <qtouchdevice></qtouchdevice>

#undef DVAPI

#undef DVVAR

#ifdef TOONZQT_EXPORTS

#define DVAPI DV_EXPORT_API

#define DVVAR DV_EXPORT_VAR

#else

#define DVAPI DV_IMPORT_API

#define DVVAR DV_IMPORT_VAR

#endif

//----------------------------------------------------------------------------

//  Forward declarations

class TRasterImageP;

class TToonzImageP;

class TVectorImageP;

class QTouchEvent;

class QGestureEvent;

//----------------------------------------------------------------------------

/*!

  \brief    The PlaneViewer class implements a basic OpenGL widget showing a

  plane in a

            standard top-down view, and supports image drawing from the Toonz

  images API.

  \details  A PlaneViewer instance is designed to view bidimensional objects

  layed-out

            on a plane, providing standard mouse interaction functions and some

  built-in

            keyboard shortcuts to provide view navigation.

            The class implements the necessary methods to draw objects on the

  plane -

            prominently, functions to push both world and widget references for

  standard

            OpenGL drawing, conversions between world and widget coordinates,

  and

            efficient image-drawing functions for all Toonz image types.

*/

/*

CAUTION : Changing PlaneViewer to inherit QOpenGLWidget causes crash bug with

shader fx for some unknown reasons. So I will reluctantly keep using the

obsolete class until the shader fx being overhauled. 2016/6/22 Shun

*/

class DVAPI PlaneViewer : public GLWidgetForHighDpi {

  Q_OBJECT

  bool m_touchActive                     = false;

  bool m_gestureActive                   = false;

  QTouchDevice::DeviceType m_touchDevice = QTouchDevice::TouchScreen;

  bool m_zooming                         = false;

  bool m_panning                         = false;

  double m_scaleFactor;  // used for zoom gesture

  bool m_stylusUsed = false;

  bool m_firstDraw;

public:

  PlaneViewer(QWidget *parent);

  // Background functions

  void setBgColor(const TPixel32 &color1, const TPixel32 &color2);

  void getBgColor(TPixel32 &color1, TPixel32 &color2) const;

  void setChessSize(double size);

  void drawBackground();

  // Image drawing functions

  void draw(TRasterP ras, double dpiX, double dpiY, TPalette *palette = 0);

  void draw(TRasterImageP ri);

  void draw(TToonzImageP ti);

  void draw(TVectorImageP vi);

  void draw(TImageP img);

  // World-Widget conversion functions

  TPointD winToWorld(int x, int y) { return m_aff.inv() * TPointD(x, y); }

  TPointD worldToWin(double x, double y) { return m_aff * TPointD(x, y); }

  TPoint qtWinToWin(int x, int y) { return TPoint(x, height() - y); }

  TPointD qtWinToWorld(int x, int y) {

    return m_aff.inv() * TPointD(x, height() - y);

  }

  TPoint winToQtWin(int x, int y) { return qtWinToWin(x, y); }

  TPointD worldToQtWin(double x, double y) {

    TPointD res(worldToWin(x, y));

    return TPointD(res.x, height() - res.y);

  }

  // World-Widget OpenGL references

  void pushGLWorldCoordinates();

  void pushGLWinCoordinates();

  void popGLCoordinates();

  // View functions

  TAffine &viewAff() { return m_aff; }

  const TAffine &viewAff() const { return m_aff; }

  void zoomIn();

  void zoomOut();

  void setViewPos(double x, double y);

  void setViewZoom(double x, double y, double zoom);

  void setViewZoom(double zoom) {

    setViewZoom(0.5 * width(), 0.5 * height(), zoom);

  }

  void moveView(double dx, double dy) {

    setViewPos(m_aff.a13 + dx, m_aff.a23 + dy);

  }

  void zoomView(double x, double y, double delta) {

    setViewZoom(x, y, m_aff.a11 * delta);

  }

  void setZoomRange(double zoomMin, double zoomMax);

  // Auxiliary functions

  TRaster32P rasterBuffer();

  void flushRasterBuffer();

public slots:

  void resetView();

  void fitView();

protected:

  int m_xpos, m_ypos;  //!< Mouse position on mouse operations.

  TAffine m_aff;       //!< Affine transform from world to widget coords.

  float m_bgColorF[6];  //!< Widget bg color cast in the [0, 1] interval.

  double m_chessSize;   //!< Size of the chessboard squares (default is 40).

  TRaster32P m_rasterBuffer;  //!< Auxiliary buffer used to draw on the widget

                              //! directly.

  double m_zoomRange[2];  //!< Viewport zoom range (default: [-1024, 1024]).

  TRect m_imageBounds;

  double m_dpiX, m_dpiY;

protected:

  virtual void contextMenuEvent(QContextMenuEvent *event) override;

  virtual void mouseMoveEvent(QMouseEvent *event) override;

  virtual void mousePressEvent(QMouseEvent *event) override;

  virtual void mouseReleaseEvent(QMouseEvent *event) override;

  virtual void wheelEvent(QWheelEvent *event) override;

  virtual void keyPressEvent(QKeyEvent *event) override;

  virtual void hideEvent(QHideEvent *event) override;

  virtual void mouseDoubleClickEvent(QMouseEvent *event) override;

  virtual void tabletEvent(QTabletEvent *e) override;

  void touchEvent(QTouchEvent *e, int type);

  void gestureEvent(QGestureEvent *e);

  virtual bool event(QEvent *e) override;

  void initializeGL() override final;

  void resizeGL(int width, int height) override final;

private:

  GLdouble m_matrix[16];

  bool m_firstResize;

  int m_width;

  int m_height;

  QPointF m_firstPanPoint;

};

#endif  // PLANE_VIEWER_H